Eldorado - Repositorium der TU Dortmund

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Bei diesem Service handelt es sich um das Institutionelle Repositorium der Technischen Universität Dortmund. Hier werden Ressourcen aus und für Lehre, Studium und Forschung gespeichert, erschlossen und der Öffentlichkeit zugänglich gemacht.

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Amtliche Mitteilungen der Technischen Universität Dortmund Nr. 9/2026
(Technische Universität Dortmund, 2026-04-15)
Transport services and mobility behavior in the Ruhr region. An analysis of the potential for system transformation and behavior change from the provider’s perspective
(2025-09-15) Kohaupt-Cepera, Kay
Mobility is a key factor in shaping sustainable urban development, yet many regions face challenges in transforming their transportation systems to meet modern demands. Despite advancements in technology and growing awareness of environmental concerns, car usage remains disproportionately high in several metropolitan areas. Understanding the structural characteristics and governance factors influencing mobility systems is crucial for identifying effective pathways for transformation. The Ruhr region exemplifies these challenges with its unique metropolitan structure and reliance on cars despite its dense population and extensive public transport network. While research on mobility behavior exists, much of it centers around user perspectives, often neglecting provider-side dynamics and governance levels. This article addresses this gap by examining the transformation of the Ruhr region’s transportation system from the perspective of mobility providers and public authorities. Through expert interviews with representatives from these institutions, the study explores potential changes and transformation paths while linking provider-related factors to established behavioral theories. The analysis differentiates between governance levels for the article to offer actionable recommendations for stakeholders. From the providers’ perspective, public transportation requires greater flexibility, improved acceptance, and a revision of funding and coordination structures away from mere profit orientation. Surveying and incorporating travelers’ individual needs and contexts into service design could foster acceptance among users. Additionally, integrating sharing and on-demand solutions within a synchronized public transport framework could improve flexibility. These services should not be treated as isolated components but as integral elements of a holistic transformation focused on evolving usage practices within the mobility system.
Spaces of Research: The University
(2026) Kaldewey, David
This contribution explores the significance of place and space for doing science. Specifically, it asks how universities become places where research is enabled and driven forward. First, the complex character and fuzzy boundaries of universities are discussed. Second, three dimensions of the university as a space are differentiated: the socio-structural, the semantic-symbolic and the physical-material. Finally, the concept of “research atmospheres” is introduced to foreground the third dimension, which has often been neglected in academic and public debates about the university.
Total syntheses of (-)-Scabrolide B and related marine natural products
(2025) Lin, Davy Sébastien; Fürstner, Alois; Hiersemann, Martin
The furanobutenolide-derived norcembranoid diterpenes are a rare family of natural products isolated mainly in Sinularia-type soft coral. Among these molecules, it was discovered in 2022 that scabrolide B possesses a 6/7/5/5 carbocyclic core, instead of the initially postulated 7/6/5/5 core. The objective of this thesis is to accomplish a total synthesis of that natural product. Two convergent approaches to scabrolide B were investigated, each relying on a ring-closure of the central seven-membered ring: one by ring closing metathesis and one via intramolecular enolate alkenylation. In both approaches, the precursors required for ring-closure were synthesized by a 1,4 addition between a protected bicyclic lactone and a (R)-carvone derivative. If both approaches converge on a common intermediate en route to the total synthesis of scabrolide B, only the alkenylation route afforded a reliable supply of the natural product, providing 110 mg in a single run over 19 steps (longest linear sequence) and 1.2% overall yield. Scabrolide B was subsequently transformed into the sister norcembranoids fragilolide A, sinuscalide C and ineleganolide, the latter could further be converted into horiolide and kavaranolide, supporting the biosynthetic sequence proposed in the literature. Overall, a series of polycyclic norcembranoids and their derivatives were synthesized, providing valuable material and insight for future studies on the biological activity of this rare family of molecules.
Illuminating the top quark
(2025) Wendland, Björn; Kröninger, Kevin; Mitzel, Dominik
The rich datasets collected by the ATLAS and CMS experiments proton–proton collisions of the Large Hadron Collider at a center-of-mass energy of 13 TeV allow high-precision measurements of top-quark properties and enable the experimental exploration of several rare top-quark processes for the first time. The t-channel single-top-quark production in association with a photon is such a process. Measurements of this signal process directly probe the top-quark–photon interaction, which is a cornerstone of electroweak physics. In this work, this process is examined using events selected from the data collected by the ATLAS experiment that contain either an electron or a muon, at least one photon, high missing transverse momentum, and a particle jet initiated by a bottom quark. Studying final states with photons, such as that of the signal process, using proton–proton collision data is challenging, as the majority of reconstructed photon candidates are background photons arising from hadronic activity. This requires excellent rejection of such candidates, which is achieved by applying photon-isolation and photon-identification requirements. Precise measurements of their efficiencies are vital for ensuring consistently high performance and for accurate modeling of the contribution of signal photons in simulation. This work introduces improvements to the method used for measuring the photon-identification efficiency at high photon energies and presents the respective measurement results. The largest background contributions to the selected data arise from the production of top-quark pairs in association with a photon, from events where an electron is misidentified as a photon, and from the production of a W boson in association with a photon and particle jets. Background contributions arising from events with background leptons and background photons are estimated using data-driven techniques. Only a small fraction of the selected events originate from the signal process. Deep neural networks are employed to efficiently discriminate between signal and background contributions. This thesis presents the first observation of the signal process, achieved with a statistical significance of 9.3 standard deviations using these neural networks. This observation represents a milestone in electroweak physics. Two fiducial cross sections of the signal process are measured with a precision of 11%. Their values are found to be compatible with Standard Model predictions at next-to-leading order accuracy in quantum chromodynamics at the level of 2.0 and 2.1 standard deviations.